#ifndef LIST_H
#define LIST_H

#include <bits/stdc++.h>

struct ListNode {
	int val;
	ListNode* next;
	ListNode():val(0), next(nullptr) {}
	ListNode(int x) : val(x), next(nullptr) {}
	ListNode(int x, ListNode* next) : val(x), next(next) {}
};

#endif